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Attack is likely to raise concerns about security of coming elections

WSJ video shows the scene of a suicide-bomb attack in Kabul's Qalay Nazar area on Sunday. The attack, claimed by Islamic State, killed scores of people and wounded many others. Photo: Hedayatullah Amid/EPA/Shutterstock

KABUL—A suspected Islamic State suicide bomber struck a voter-registration center in the Afghan capital on Sunday, killing at least 57 people in an attack aimed at inciting sectarian strife and undermining long-delayed parliamentary elections.

The attacker detonated his explosive belt among a crowd of Afghans who had lined up outside the center, a government-rented building, in the mainly Shiite Muslim district of Dashte Barchi in western Kabul to obtain the identification cards they needed to cast their ballots in the elections,...